See also:

Problems with the SmartKey
Problem Possible causes/consequences and Solutions You cannot lock or unlock the vehicle using the SmartKey. The SmartKey battery is discharged or nearly discharged. - ...

Override feature for the rear side windows
WARNING When children ride on the vehicle's rear seats, activate the override switch. Otherwise, the children could be injured, e.g. by trapping themselves in the rear side window. ...

More power, lower consumption: the engines
An improvement of up to 31 per cent has been achieved in fuel consumption and all Mercedes-Benz C-Class launch models will feature the ECO start/stop function as standard. All the engine variants ...